Method of leather-covering conical clutch members.



E. W. SIKES.

METHOD 0 LEATHER COVERING GONIGAL CLUTCH MEMBERS.

nrmouxon EILED MAY 17-, 1910. v

Patented May 23, 1911.

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nennnr w. srxns, or MILWAUKEE, Wisconsin.

Specification of Letters Patent.

oFFIoE.

METHOD OF LEATHER COVER-TNG CONICAL CLUTCH MEMBERS.

Patented May 23, 1911.

Applieationfiled May 17, 1910'. Serial No. 561,857.

To allwhom it may concern: Be it known that I, EGBERT W. SIKES, a

' citizen of the'United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Methods of Leather-Covering Conical Clutch Members; and I-do hereby declare that the following is a full, clear, and exact description thereof.

The object of my invention is to provide a' simple and economical. method for leather covering conical faced clutch members, the method being such that by a succession of steps a dry leather belt of uniform thickness is expanded upon the conical clutch member face'to form a smooth surface of predeter mined thickness, of gradually decreasing density from the major axes of said clutch face, whereby a trued surface is insured as a gripping face, its efliciency and economy being further increased due to the fact that the method .renders it possible to reduce the number of retaining rivets as would ordinarily be used in the standard method of applying leather belts, the standard method requiring a greater number in order that the belt or friction face he held against bunching incidental to a gripping strain between the clutch members.

Vith the above objects in view the method consists in a series of successive steps as set forth hereinafter with reference to the accompanying drawings and subsequently claimed.

In the drawings Figure 1 represents a cross-section ofa conical faced pulley provided with a leather sheath placed thereon in accordance with my invention, the pulley constituting a clutch member; Fig. 2, a face view of the same; Fig. 3, a sectional elevation of a leather belt adapted to be inserted upon the'pulley, the belt. as shown, having circular edges of primarily equal diameters with a face of greater width thanthe conical face of the pulley to which it is to be ap plied, and Fig. 4:, a face view of the belt illustrating the joint formed by lapping skived ends of a single leather strip.

Referring by characters to the drawings l represents a conical faced pulley of stand ard type provided with a leather friction belt 2, which belt is secured to the conical face of the pulley by a series of sets of rivets 3, that pass through and clench the leather belt in the usual manner.

In carrying out my improved method a eylindrical belt of leather 2, is first formed from a single straight strip having its ends skived and lap-jointed-as shown in'Fig. 4:. the ends being secured bv cementing or other suitable means. This belt, as shown in Fig. 3, 1S of greater width than the conical face of the pulley to which it is/to be attached and its circular edge are primarily of equal diameters, these primary equal diameters being of less proportion than the smallest diameter of the conical face of the pullev.

The interior surface of the leather belt is also shaved down before "or after the ends of belt has a uniform thickness throughout. The belt, as shown in Fig. 3 .is then expanded in its dry state upon the conical face of the pulley without any appreciable reduction in its thickness, the expansion being compensated for by contraction of the width of the belt, whereby when the same is in position upon the conical face it will be, as shown, equal in width to said pulley face. By applying the belt in the manner stated a smooth, taut working'face having an abs lutely true surface is obtained. The belt is thereafter secured to the pulley face or flange by boring a. series of sets of holes through the belt and flange simultaneously, through which bored apertures securingrivets are inserted. Owing to this method pulley, which face, if primarily true. can be left in the rough and when the leather belt is expanded thereon the gripping face will be perfectly true and smooth. It will also be observed that the leather belt is expanded iii-progressive increased proportions froin one edge to the other and when: adjusted to its position its face of lesser diameter will be necessarily under less compression and thus the fiber of the belt at this point is capable of proportionately greater resiliency. The result of this resiliency 1nsures a positive and more perfect grip be tween the clutch members, due to the fact entire face.

While I have shown the leather belt as 'made from a single strip of leather, it is the strip are united into a belt, so that said of applying the belt it is also possible to eliminate machining the friction face of the that it is at this point that the clutching economy my method are cut in straight strips and obvious that when greater thickness is required two or more layers of leather may be secured together. 7 p

The usual method for leather covering conical pulleys employed is to. first form a blank that is out upon the arc of a circle whereby a conical belt corresponding to the conical face of the pulley is obtained. The conical belt i sthen applied to the clutch by wrapping the same thereaboutand drawing the ends together with the proper tool, whereby only a slight stretch is obtained, the belt ends being thereafter riveted. The belts are then riveted to the face of the pulley through holes in said pulley-face made rior to insertingthe leather thereon. After these rivets are in lace, owing to the slight stretch of the leat ier, the same will.

have'a tendency to. full up, this being so even thou' h utilized. Vith my improved method as stated heretofore, a great saving in rivets is attained over this old method. A further lies in the fact that belts used in thus-all material can be utilized in the stock or. blank from which they are "cut. In the L ordinary method employed, the strips being rout-from the arc of a circle in order that ,1

a great number of rivets are tion, lap-joining and the strip to diameter than the minor diameter of thethey-may conform to the conical clutch face,

there is great Waste of leather forthe reason that the belts are cut circular and therefore a number of inches in the given area of leather must go to waste, the expense under such conditions being apparent.

I claim: I

A method of leather covering a conical face pulley, the same consisting of cutting a straight strip of dry leather having an approximately uniform thickness in cross-secsecuring the ends of form a cylindricalbelt of lesser conical face pulley, expanding the cylindrical belt upon the face of said pulley whereby said belt is converted from cylindrical to conical form incidental to its incasement of the aforesaid pulley face, and

thereafter riveting the belt to the face of the pulley.

In testimony that I clalm the foregoing I have hereunto set my hand at Milwaukee,

in the county of Milwaukee and State of \Visconsin, in the presence of two witnesses.

. EGBERT W. SIKES. Witnesses:

G120. W. YoUNc, MAY DOWNEY. 

